问题 选择题

石油没有固定的沸点,加热石油使不同沸点的组分分别气化、冷凝,分离后能得到汽油、煤油、柴油等产品,由此可以判断石油属于 ( )

A.化合物

B.混合物

C.单质

D.纯净物

答案

B

方法一:由于混合物没有固定的沸点,且石油也没有固定的沸点,故石油属于混合物。

方法二:石油加热过程中只涉及气化、冷凝,均属于物理变化,且分离得到不同产物,故石油属于混合物。

材料分析题

北京残奥会开幕式文艺表演上,舞蹈《永不停跳的舞步》催人泪下。领舞者李月原本是一位学芭蕾的小女孩,在汶川地震中失去左腿,虽承受巨大内心痛苦,但她一刻也没放弃对芭蕾的追求,不想让舞蹈的梦想屈从于残酷的命运。她重新起舞,向世界、向伤残的小伙伴,也向自己证明:地震折不断我的梦想,超越自我,就仍能高高飞翔。

(1)李月面对挫折和逆境,是如何实现她的梦想的?

                                                                                                                                                              

                                                                                                                                                              

(2)自强的心理品质帮助李月走出痛苦,重新起舞。请结合李月的事迹,谈谈这种心理品质对实现人生目标的作用。

                                                                                                                                                               

                                                                                                                                                               (3)李月是我们学习的榜样。请联系自身实际,谈谈你打算怎样磨砺自强这一心理品质。

                                                                                                                                                                

                                                                                                                                                                

                                                                                                                                                                

                                                                                                                                                                 

问答题 简答题